the president and first lady took part in projects in dc and virginia. in the meantime in the footprints of the twin towers, work on the ground zero memorial continues. there will be two reflecting pools, each with a waterfall flowing into a deeper pool. >> that memorial at ground zero should be complete by next september 11, a permanent memorial should also be in pennsylvania by then. >> many chicago-land communities are holding services paying tribute to 9/11 victims. we report on one in naperville honoring a navy commander from there who died in the pentagon attack. >> reporter: this memorial service was timed to wonder with the horrific effects nine years ago today. it was a time to pause and remember what no one here will ever forget. >> we saw 200,000-some tons of steel, dust, mixed with everything else. we went underground to search the parking garages that caught on fire five floors down. we searched numerous voids for live victims but found none. >> reporter: the captain encountered his 18-hour days searching ground zero for bodies and remains.